Email domain being returned as spam by Comcast

@XfinityChristina​ This is an issue when I try to email people that use email addresses that end in @comcast.net from an account hosted by Dotster.

I have comcast email as well as the personal domain through Dotster.  The Dotster hosted email is rejected by comcast accounts (including my own comcast email).

Here is a sample response that I receive:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  #######@comcast.net
    host mx2c1.comcast.net [96.102.18.149]
    SMTP error from remote mail server after MAIL FROM:<###@####.com> SIZE=3404:
    554 5.1.0 66.96.184.9 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000
Reporting-MTA: dns; bosmailout09.eigbox.net

Action: failed
Final-Recipient: rfc822;######@comcast.net
Status: 5.0.0
Remote-MTA: dns; mx2c1.comcast.net
Remote-MTA: X-ip; [96.102.18.149]
X-Remote-MTA-smtp-greeting: X-str; 220 resimta-c1p-044896.sys.comcast.net resimta-c1p-044896.sys.comcast.net ESMTP server ready
X-Remote-MTA-helo-response: X-str; 250-resimta-c1p-044896.sys.comcast.net hello [66.96.184.9], pleased to meet you
X-Exim-Diagnostic: X-str; SMTP error from remote mail server after MAIL FROM:< [Edited: "Personal Information"]> SIZE=3404: 554 5.1.0 66.96.184.9 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000
Diagnostic-Code: smtp; 554 5.1.0 66.96.184.9 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000

Thanks for sending it over. Are email the only service troubles you are experiencing. On our end we do not block third party services or emails. Are you able to send emaisl from your comcast email to other comcast or personal emails? 

Sending emails from my comcast account is not a problem.  It works as expected.  The issue that I'm having is that comcast appears to be rejecting the emails sent from my other domain by classifying them as spam.

X-Exim-Diagnostic: X-str; SMTP error from remote mail server after MAIL FROM:< [Edited: "Personal Information"]> SIZE=3404: 554 5.1.0 66.96.184.9 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000